Do you know? Do you know if /whether Cathy goes to school early? 注意:只能用whether而不用if的三种情况如下: ①与or not连用:They asked us whether or not we were coming. ②在...
（1） 'Used to' describes repeated actionsor habits in the past.“Used to” 可以描述过去时常做的事情或过去的习惯。I used toplay football after school.（2） 'Used to' describes statesor things that happened over a long period of time.“Used to” 可...
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